A confocal microscope apparatus capable of increasing a degree of freedom in varying sectioning resolution while keeping a configuration of a confocal microscope simple. The confocal microscope apparatus includes a confocal microscope capable of detecting two or more microscopic appearances with different sectioning and an arithmetic unit that performs arithmetic operations on data of the two or more microscopic appearances detected by the confocal microscope to create data of a microscopic appearance at sectioning resolution different from that of those microscopic appearances. Even if the number of actually measured microscopic appearances is two, it is possible to vary the diameter of a virtual-confocal diaphragm by performing arithmetic operations thereon, and therefore, an arbitrary sectioning resolution can be realized.